mobile - Slide-up view in Flutter

Mobile - Slide-up view in Flutter

In Flutter, creating a slide-up view or modal bottom sheet is a common pattern used to display additional content or options without completely covering the main screen. You can achieve this using showModalBottomSheet combined with ListView or Column widgets for content.

Here's a step-by-step guide to implement a slide-up view in Flutter:

Step 1: Import Required Packages

Make sure you have imported the necessary Flutter packages in your Dart file:

import 'package:flutter/material.dart';

Step 2: Implement the Slide-Up View

Use showModalBottomSheet to display a modal bottom sheet. Here's an example implementation:

void main() => runApp(MyApp()); class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Slide-Up View Demo', theme: ThemeData( primarySwatch: Colors.blue, ), home: MyHomePage(), ); } } class MyHomePage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Slide-Up View Demo'), ), body: Center( child: ElevatedButton( onPressed: () { // Show slide-up view showModalBottomSheet( context: context, builder: (BuildContext context) { return Container( height: 300, child: Column( mainAxisAlignment: MainAxisAlignment.center, children: <Widget>[ Text('Slide-Up View', style: TextStyle(fontSize: 24)), SizedBox(height: 20), ElevatedButton( onPressed: () { Navigator.of(context).pop(); }, child: Text('Close'), ), ], ), ); }, ); }, child: Text('Open Slide-Up View'), ), ), ); } }

Explanation:

  • showModalBottomSheet: This function displays a modal bottom sheet that slides up from the bottom of the screen.

  • builder: The builder function returns the content of the modal bottom sheet. In this example, it's a Column containing some text and a close button.

  • Navigator.of(context).pop(): This is used to dismiss the bottom sheet when the close button is pressed.

  • Customization: You can customize the height, content, and appearance of the bottom sheet according to your app's design requirements. For example, replace Column with a ListView or any other widget that suits your content layout.

Additional Customization:

  1. Custom Content: Replace the Column with your desired widgets for displaying content, such as images, lists, or forms.

  2. Height: Adjust the Container height as needed to fit your content or use double.infinity for dynamic height based on content.

  3. Animation: showModalBottomSheet provides default animation for the bottom sheet. You can further customize animations using animationController and isDismissible parameters.

Implementing a slide-up view in Flutter using showModalBottomSheet is straightforward and provides a smooth user experience for displaying additional information or actions. Adjust the content and styling to fit your specific application's design and functionality requirements.

Examples

  1. Slide-up Bottom Sheet in Flutter: Description: Implement a slide-up bottom sheet that shows content from the bottom of the screen.

    showModalBottomSheet( context: context, builder: (BuildContext context) { return Container( height: 200, color: Colors.white, child: Center( child: Text('Slide-up content'), ), ); }, );

    This code displays a modal bottom sheet that slides up from the bottom of the screen with a fixed height of 200 and displays "Slide-up content".

  2. Persistent Bottom Sheet in Flutter: Description: Create a persistent bottom sheet that remains visible at the bottom of the screen.

    Scaffold( body: Column( children: <Widget>[ // Your main content here ], ), bottomSheet: Container( height: 200, color: Colors.white, child: Center( child: Text('Persistent bottom sheet'), ), ), );

    In this example, the bottom sheet remains visible at the bottom of the screen, showing "Persistent bottom sheet" content.

  3. Draggable Bottom Sheet in Flutter: Description: Implement a draggable bottom sheet that users can swipe up to reveal.

    showBottomSheet( context: context, builder: (BuildContext context) { return DraggableScrollableSheet( builder: (BuildContext context, ScrollController scrollController) { return Container( color: Colors.white, child: ListView.builder( controller: scrollController, itemCount: 25, itemBuilder: (BuildContext context, int index) { return ListTile( title: Text('Item $index'), ); }, ), ); }, ); }, );

    This code creates a draggable bottom sheet using DraggableScrollableSheet, allowing users to swipe up and down to reveal and dismiss the sheet.

  4. Sliding Panel with GestureDetector in Flutter: Description: Implement a slide-up panel that can be triggered with a swipe gesture.

    class SlideUpPanel extends StatelessWidget { @override Widget build(BuildContext context) { return GestureDetector( onVerticalDragStart: (details) { // Handle drag start }, onVerticalDragUpdate: (details) { // Handle drag update }, onVerticalDragEnd: (details) { // Handle drag end }, child: Container( height: 200, color: Colors.white, child: Center( child: Text('Slide-up panel'), ), ), ); } }

    This example sets up a GestureDetector to detect vertical drag gestures, enabling the slide-up panel functionality with custom handling for start, update, and end events.

  5. Expandable Panel with AnimatedContainer in Flutter: Description: Create an expandable panel that animates its height change.

    class ExpandablePanel extends StatefulWidget { @override _ExpandablePanelState createState() => _ExpandablePanelState(); } class _ExpandablePanelState extends State<ExpandablePanel> { bool _isExpanded = false; @override Widget build(BuildContext context) { return Column( children: <Widget>[ GestureDetector( onTap: () { setState(() { _isExpanded = !_isExpanded; }); }, child: Container( height: 50, color: Colors.blue, child: Center( child: Text(_isExpanded ? 'Collapse' : 'Expand'), ), ), ), AnimatedContainer( duration: Duration(milliseconds: 300), height: _isExpanded ? 200 : 0, color: Colors.white, child: Center( child: Text('Expandable content'), ), ), ], ); } }

    This Flutter code creates an expandable panel with an animated height change when tapping on the header, toggling between expanded and collapsed states.

  6. Sliding Up Panel Package in Flutter: Description: Use the sliding_up_panel package to implement a slide-up panel with additional features.

    dependencies: sliding_up_panel: ^1.0.1 
    import 'package:sliding_up_panel/sliding_up_panel.dart'; class SlideUpPanelExample extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( body: SlidingUpPanel( maxHeight: 200, panel: Center( child: Text('Sliding up panel'), ), ), ); } }

    This example uses the sliding_up_panel package to create a slide-up panel with a maximum height of 200, showing "Sliding up panel" content.

  7. Custom Slide-up Animation in Flutter: Description: Implement a custom slide-up animation for a panel using AnimatedBuilder and Tween.

    class SlideUpAnimation extends StatefulWidget { @override _SlideUpAnimationState createState() => _SlideUpAnimationState(); } class _SlideUpAnimationState extends State<SlideUpAnimation> with SingleTickerProviderStateMixin { AnimationController _controller; Animation<double> _animation; @override void initState() { super.initState(); _controller = AnimationController( vsync: this, duration: Duration(milliseconds: 500), ); _animation = Tween<double>(begin: 0, end: 1).animate(_controller); } @override Widget build(BuildContext context) { return GestureDetector( onTap: () { _controller.forward(); }, child: AnimatedBuilder( animation: _controller, builder: (BuildContext context, Widget child) { return Transform.translate( offset: Offset(0, _animation.value * 200), child: Container( height: 200, color: Colors.white, child: Center( child: Text('Slide-up animation'), ), ), ); }, ), ); } @override void dispose() { _controller.dispose(); super.dispose(); } }

    This code demonstrates a custom slide-up animation using AnimatedBuilder and Transform.translate to slide up a panel with "Slide-up animation" content.

  8. DraggableScrollableSheet with ListView in Flutter: Description: Use DraggableScrollableSheet with a ListView inside for a draggable scrollable panel.

    DraggableScrollableSheet( builder: (BuildContext context, ScrollController scrollController) { return Container( color: Colors.white, child: ListView.builder( controller: scrollController, itemCount: 25, itemBuilder: (BuildContext context, int index) { return ListTile( title: Text('Item $index'), ); }, ), ); }, );

    This Flutter code creates a draggable scrollable sheet with a ListView.builder inside, allowing users to scroll through items in the panel.

  9. BottomNavigationBar with Slide-up Content in Flutter: Description: Integrate a BottomNavigationBar with slide-up content for each navigation item.

    class BottomNavSlideUp extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( body: Center( child: Text('Main content'), ), bottomNavigationBar: BottomNavigationBar( items: [ BottomNavigationBarItem(icon: Icon(Icons.home), label: 'Home'), BottomNavigationBarItem(icon: Icon(Icons.settings), label: 'Settings'), ], onTap: (int index) { // Handle tap event switch (index) { case 0: // Show slide-up content for Home break; case 1: // Show slide-up content for Settings break; } }, ), ); } }

    This example sets up a BottomNavigationBar with different tabs (Home and Settings) that show corresponding slide-up content when tapped.

  10. Nested Slide-up Panels in Flutter: Description: Implement nested slide-up panels for complex UI interactions.

    class NestedSlideUpPanels extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( body: Stack( children: <Widget>[ Positioned.fill( child: Center( child: Text('Main content'), ), ), Positioned( bottom: 0, left: 0, right: 0, child: DraggableScrollableSheet( initialChildSize: 0.3, minChildSize: 0.1, builder: (BuildContext context, ScrollController scrollController) { return Container( color: Colors.white, child: ListView.builder( controller: scrollController, itemCount: 25, itemBuilder: (BuildContext context, int index) { return ListTile( title: Text('Item $index'), ); }, ), ); }, ), ), ], ), ); } }

    This code sets up nested slide-up panels using Positioned and DraggableScrollableSheet, allowing for a main content area and a secondary panel at the bottom.

More Tags

pythagorean data-binding unicorn firebase-crash-reporting youtube-api dispatcher css-loader dispatchworkitem rolling-computation

More Programming Questions

More Housing Building Calculators

More Physical chemistry Calculators

More Livestock Calculators

More Statistics Calculators